函式内的叫区域变数 函式外的叫全域变数 参考资料：w3school、Mozilla 开发者中心 （这两个够权威了吧- -） http://www.w3schools.com/js/js_functions.asp The Lifetime of JavaScript Variables When you declare a variable within a function, the variable can only be accessed within that function. When you exit the function, the variable is destroyed. These variables are called local variables. You can have local variables with the same name in different functions, because each is recognized only by the function in which it is declared. If you declare a variable outside a function, all the functions on your page can access it. The lifetime of these variables starts when they are declared, and ends when the page is closed. http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Guide:Variables When you declare a variable outside of any function, it is called a global variable, because it is available to any other code in the current document. When you declare a variable within a function, it is called a local variable, because it is available only within that function. --

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